Which of the following is not a place that could be located by its name?

The reasoning for identifying "Pine Avenue and Main Street" as the choice that cannot be located by its name lies in the nature of the name itself. This option refers to an intersection comprising two street names rather than a singular, recognized place or landmark. While it indicates a possible geographic location, it does not denote a specific named place that is widely recognized or easily identified by the general public.

In contrast, all other options represent distinct places that have associated names recognized by inhabitants and the broader community. For instance, "Denver Art Museum" is a notable cultural institution, "Ethiopia" is a recognized country with geographic boundaries, and "New York's Central Park" is a famous urban park. Thus, they can be readily located and acknowledged as named places based on their descriptions. This distinction clarifies why the specific intersection does not fulfill the criteria for a named place.